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Loans Payable - Note 7 - Monaco 2018 - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 31, 2020
Mar. 31, 2018
Oct. 01, 2016
Debt Instrument [Line Items]          
Aggregate amount issuable         $ 3,000,000
Note 7 - Monaco 2018 [Member]          
Debt Instrument [Line Items]          
Loan amount borrowed       $ 1,000,000  
Interest rate, stated percentage 10.00%        
Agreement description During the period ended March 31, 2018, Monaco advanced us $1.0 million that was applied to a loan agreement that was executed on April 20, 2018. Monaco also agreed to treat $99,366 of back rent owed by us to Monaco as part of this loan resulting in an aggregate principal amount of $1,099,367 at December 31, 2020 and 2019. The indebtedness bears interest at 10.0% percent per year. During January 2020 this loan agreement was amended by increasing the interest rate to 18%. All principal and any unpaid interest is to be payable on the first anniversary of this agreement, April 20, 2019. This debt is secured by cash proceeds, if any, from our future shipwreck projects we have contracted with Magellan. As additional consideration, their share purchase option expiration date, as discussed in Note 1 – Monaco 2014 and Note 2 – Monaco 2016 above, has been extended from 30 days to seven months after the note becomes paid in full. For the twelve months ended December 31, 2020 and 2019, interest in the amount of $138,333 and $123,466, respectively, was recorded.        
Back rent considered as part of loan       $ 99,366,000,000  
Aggregate amount issuable $ 1,099,367 $ 1,099,367      
Accrued interest $ 138,333 $ 123,466      
Interest rate, increased percentage     18.00%